 


function Base64() {  
	   _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";  
	   this.encode = function (input) {  
	       var output = "";  
	       var chr1, chr2, chr3, enc1, enc2, enc3, enc4;  
	       var i = 0;  
	       input = _utf8_encode(input);  
	       while (i < input.length) {  
	           chr1 = input.charCodeAt(i++);  
	           chr2 = input.charCodeAt(i++);  
	           chr3 = input.charCodeAt(i++);  
	           enc1 = chr1 >> 2;  
	           enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);  
	           enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);  
	           enc4 = chr3 & 63;  
	           if (isNaN(chr2)) {  
	               enc3 = enc4 = 64;  
	           } else if (isNaN(chr3)) {  
	               enc4 = 64;  
	           }  
	           output = output +  
	           _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +  
	           _keyStr.charAt(enc3) + _keyStr.charAt(enc4);  
	       }  
	       return output;  
	   }  
	   this.decode = function (input) {  
	       var output = "";  
	       var chr1, chr2, chr3;  
	       var enc1, enc2, enc3, enc4;  
	       var i = 0;  
	       input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");  
	       while (i < input.length) {  
	           enc1 = _keyStr.indexOf(input.charAt(i++));  
	           enc2 = _keyStr.indexOf(input.charAt(i++));  
	           enc3 = _keyStr.indexOf(input.charAt(i++));  
	           enc4 = _keyStr.indexOf(input.charAt(i++));  
	           chr1 = (enc1 << 2) | (enc2 >> 4);  
	           chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);  
	           chr3 = ((enc3 & 3) << 6) | enc4;  
	           output = output + String.fromCharCode(chr1);  
	           if (enc3 != 64) {  
	               output = output + String.fromCharCode(chr2);  
	           }  
	           if (enc4 != 64) {  
	               output = output + String.fromCharCode(chr3);  
	           }  
	       }  
	       output = _utf8_decode(output);  
	       return output;  
	   }
	   
	   _utf8_encode = function (string) {  
	       string = string.replace(/\r\n/g,"\n");  
	       var utftext = "";  
	       for (var n = 0; n < string.length; n++) {  
	           var c = string.charCodeAt(n);  
	           if (c < 128) {  
	               utftext += String.fromCharCode(c);  
	           } else if((c > 127) && (c < 2048)) {  
	               utftext += String.fromCharCode((c >> 6) | 192);  
	               utftext += String.fromCharCode((c & 63) | 128);  
	           } else {  
	               utftext += String.fromCharCode((c >> 12) | 224);  
	               utftext += String.fromCharCode(((c >> 6) & 63) | 128);  
	               utftext += String.fromCharCode((c & 63) | 128);  
	           }  
	  
	       }  
	       return utftext;  
	   }  
	  
	   // private method for UTF-8 decoding  
	   _utf8_decode = function (utftext) {  
	       var string = "";  
	       var i = 0;  
	       var c = c1 = c2 = 0;  
	       while ( i < utftext.length ) {  
	           c = utftext.charCodeAt(i);  
	           if (c < 128) {  
	               string += String.fromCharCode(c);  
	               i++;  
	            } else if((c > 191) && (c < 224)) {  
	                c2 = utftext.charCodeAt(i+1);  
	                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));  
	                i += 2;  
	            } else {  
	                c2 = utftext.charCodeAt(i+1);  
	                c3 = utftext.charCodeAt(i+2);  
	                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));  
	                i += 3;  
	            }  
	        }  
	        return string;  
	    } 
	      
	}  







